PLATE 3 



1 Immature scorpion. Buthus occitanus. Neuromeres of the suboesopha- 

 geal ganglion. X 40. Sagittal section through median line of cephalothora.s' 

 outlined from the photograph showing 9 neuromeres, of which the 6th is well 

 defined and normal in .«;ize. A, artery from which branches run between neuro- 

 meres; BR, brain; C, caeca of the intestine; CT, connective tissue and muscles; 

 GSO, suboesophageal ganglion; GAi, 1st abdominal ganglion; HT, heart; INT, 

 intestine; OES, oesophagus; 0, median eye. 



2 Photograph from which the above drawing was outlined. 



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